- 著者
-
Shunsuke Nakamori
Jun Takahashi
Sumiko Hyuga
Jinwei Yang
Hiroaki Takemoto
Takuro Maruyama
Naohiro Oshima
Nahoko Uchiyama
Yoshiaki Amakura
Masashi Hyuga
Takashi Hakamatsuka
Yukihiro Goda
Hiroshi Odaguchi
Toshihiko Hanawa
Yoshinori Kobayashi
- 出版者
- The Pharmaceutical Society of Japan
- 雑誌
- Biological and Pharmaceutical Bulletin (ISSN:09186158)
- 巻号頁・発行日
- vol.42, no.9, pp.1538-1544, 2019-09-01 (Released:2019-09-01)
- 参考文献数
- 34
- 被引用文献数
-
12
The analgesic effect of Ephedra Herb (EH) is believed to be derived from the anti-inflammatory action of pseudoephedrine (Pse). We recently reported that ephedrine alkaloids–free EH extract (EFE) attenuates formalin-induced pain to the same level as that achieved by EH extract (EHE), which suggests that the analgesic effect of EH may not be due to ephedrine alkaloids (EAs). To examine the contribution of EAs to the analgesic effect of EH, mice were injected with formalin to induce a biphasic pain reaction (first phase, 0–5 min; second phase, 10–45 min) at various time points after oral administration of the following test drugs: ephedrine (Eph), Pse, “authentic” EHE from Tsumura & Co. (EHE-Ts), EFE, and EHE that was used as the source of EFE (EHE-To). Biphasic pain was suppressed at 30 min after administration of Eph, EHE-Ts, and EHE-To. At 6 h after administration of EFE, EHE-To, and Pse—and at 4 to 6 h after administration of EHE-Ts—only second-phase pain was suppressed; however, the effect of Pse at 6 h was not significant. These results suggested that EHE has a biphasic analgesic effect against biphasic formalin-induced pain: in the first phase of analgesia (30 min after administration), biphasic pain is suppressed by Eph; in the second phase of analgesia (4–6 h after administration), second-phase pain is alleviated by constituents other than EAs, although Pse may partially contribute to the relief of second-phase pain.